Die paddle clamping method for wire bond enhancement

ABSTRACT

A leadframe configuration for a semiconductor device has a die attach paddle with paddle support bars. In addition, clamp tabs extend outwardly from lesser supported locations of the paddle to underlie a conventional lead clamp. The clamp tabs are formed as an integral part of the paddle. Normal clamping during die attach and wire bonding operations prevents paddle movement and enhances integrity of the die bond and wire bonds.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to a semiconductor device assembly including a semiconductor die and leadframe. More particularly, the invention pertains to a leadframe with a mounting paddle to which a semiconductor die is bonded and with a plurality of leads of the lead frame connected to the bond pads on the die by wire bonding.

2. State of the Art

In the manufacture of semiconductor device assemblies, a single semiconductor die is most commonly incorporated into each sealed package. Many different package styles are used, including dual inline packages (DIP), zig-zag inline packages (ZIP), small outline J-bends (SOJ), thin small outline packages (TSOP), plastic leaded chip carriers (PLCC), small outline integrated circuits (SOIC), plastic quad flat packs (PQFP), and interdigitated leadframe (IDF). Some semiconductor device assemblies are connected to a substrate such as a circuit board prior to encapsulation.

The assembly of a semiconductor device and a leadframe and die ordinarily includes bonding of the die to a paddle of the leadframe, and wire bonding bond pads on the die to inner leads, i.e. lead fingers, of the leadframe. The inner leads, semiconductor die, and bond wires are then encapsulated, and extraneous parts of the leadframe excised.

In drawing FIG. 1, an exemplary PRIOR ART leadframe strip 10 is shown. The leadframe strip 10 comprises a thin metal foil. The leadframe strip 10 is configured for the mounting of a plurality of semiconductor die, one on each die mount paddle 12. The leadframe strip 10 also includes parallel spaced side rails 14, 16 formed with a pattern of registry holes 18 for handling by automatic machinery. In addition, the leadframe strip 10 includes an arrangement of inner leads 20 configured for attachment to the bond pads of a semiconductor die during a wire bonding step. Outer leads 22 will become the external leads of the completed semiconductor device package for connection to, e.g., a circuit board. The leads 20, 22 are connected to the side rails 14, 16 by dam bars 24, and supported thereby. As shown, each of the die mount paddles 12 is connected to each of the side rails 14, 16 by a paddle support bar 26, 28, respectively, extending transversely with respect to the centerline 30 of the leadframe strip 10.

In an alternative arrangement, not shown, the paddle support bars 26, 28 extend parallel to centerline 30 from the die mount paddles 12 to dam bars 24 for support of the paddles.

In forming a semiconductor device package, semiconductor dice are typically bonded to the paddles of the leadframe strip with an adhesive polymer such as epoxy or a thermoplastic, with soft solder, or with a gold-silicon eutectic layer. Generally, each paddle is slightly larger than the attached semiconductor die. The conductive bond pads of the semiconductor die are then wire bonded to the inner leads surrounding the semiconductor die, generally by the use of the well-known thermocompression bonding method, but sometimes by thermosonic or ultrasonic bonding methods.

During semiconductor die attach and wire bonding, the inner leads are typically clamped against a lower heater block or other flat member. The bonding tool itself is configured to compress the wire against the surface to which the wire is being a bonded, i.e., bond pad or inner lead. Examples of such are found in U.S. Pat. No. 4,600,138 of Hill, U.S. Pat. No. 4,030,657 of Scheffer, U.S. Pat. No. 4,603,803 of Chan et al., U.S. Pat. No. 4,778,097 of Hauser, U.S. Pat. No. 5,148,959 of Cain et al., U.S. Pat. No.5,217,154 of Elwood et al., U.S. Pat. No. 5,421,503 of Perlberg et al., and U.S. Pat. No. 5,445,306 of Huddleston. It has generally been found, however, that auxiliary clamping apparatus may improve the quality of "second bonding", i.e. bonding of the wire to the inner leads.

Each inner lead being wire bonded may be clamped while being wire bonded only, or all leads may be simultaneously clamped.

Commercial wire bonding machines typically have an upper clamp member which includes a window for access to the semiconductor die, die paddle and inner end portions of the inner leads. The "frame" of the window acts as a narrow clamp which simultaneously holds down the inner leads surrounding the semiconductor die against the heater block. Alternatively, clamps are inserted through a window to hold the inner leads against the heater block. These "window" types of clamping arrangements are exemplified in U.S. Pat. No. 3,685,137 of Gardiner, U.S. Pat. No. 5,035,034 of Cotney, U.S. Pat. No. 5,322,207 of Fogal et al., U.S. Pat. No. 5,372,972 of Hayashi et al., U.S. Pat. Nos. 4,765,531, 5,238,174 and 5,307,978 of Ricketson et al., U.S. Pat. No. 5,082,165 of Ishizuka, and U.S. Pat. No. 5,264,002 of Egashira et al.

Various other types of prior art clamping apparatus and methods of clamping an inner lead or bond pad against a flat lower member are illustrated in U.S. Pat. No. 4,361,261 of Elles et al., U.S. Pat. No. 4,434,347 of Kurtz et al., U.S. Pat. No. 4,978,835 of Luijtjes et al., U.S. Pat. No. 5,193,733 of You, U.S. Pat. No. 5,197,652 of Yamazaki, U.S. Pat. No. 4,821,945 of Chase et al., and U.S. Pat. No. 5,647,528 of Ball et al.

U.S. Pat. No. 3,566,207 of Adams shows a leadframe in which the paddle support bars are clamped by "point" clamps.

A major source of package rejection is wire bond failure. Such failure has been attributed to overheating, underheating, chemical contamination, surface roughness, surface voids, oxide formation, presence of moisture, inadequate lead clamping, and other suspected causes.

While a wire bond "no-stick" may sometimes be detected and reworked on the spot, wire bond defects often do not become apparent until subsequent testing, or after the device has been encapsulated and/or has been in use. At this stage, the unit cost of the device itself is maximal. In addition, repair of a defective device may not be feasible.

On occasion, the die-to-paddle bond fails and may result in, e.g., shorting within the packaged device, wire bond breakage, loss of heat dissipation capability, and/or incomplete sealing of the package.

Even a relatively low frequency of defects in the wire bonds and in die-to-paddle bonds is extremely costly to the semiconductor industry.

It is therefore an object of the invention to provide a semiconductor device wherein the frequency of wire bond failures and die-to-paddle bond failures is reduced, the frequency of required wire bond rework is reduced, and the manufacturing cost is reduced.

BRIEF SUMMARY OF THE INVENTION

It has been generally assumed in the industry that the die mount paddle does not move during down-bonding of the semiconductor die, or during subsequent wire bonding. However, it has been discovered that significant movement sometimes may exist, and this movement contributes to poor semiconductor die-to-paddle bonding and can be a major cause of the observed failure, i.e., immediate "no-stick" or subsequent debonding of the wire bonds from the bond pads of the semiconductor die and/or from the metal inner leads.

In accordance with the invention, the pattern of paddle and leads on the leadframe is configured to provide a paddle with clampable tabs extending therefrom. The tabs extend outwardly from areas of the paddle which are otherwise largely unsupported or farthest from the paddle support bars. These tabs may be formed on the sides of the paddle along which there are few if any bond pads. Alternatively, the tabs may be on the same sides as the paddle support bars, particularly when the paddle support bars on the sides have few if any bond pads. Typically, the tabs are positioned on the long dimensions of the paddle. When the leadframe is clamped for die attach and wire bonding, a clamp member such as a circumscribing "window frame" simultaneously clamps the inner leads, paddle support bars and paddle tabs against a lower clamp member which may be a heater block. The paddle is thus more extensively supported and is much more resistant to flexing, bending, and lifting away from the lower clamp member during the bonding operations.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is illustrated in the following figures, wherein the elements are not necessarily shown to scale:

FIG. 1 is a plan view of a prior art semiconductor leadframe strip;

FIG. 2 is a plan view of a wire-bonded semiconductor device having a leadframe of the invention;

FIG. 3 is a cross-sectional side view of a portion of a leadframe strip of the invention and a semiconductor die bonded thereto, as taken along line 3--3 of FIG. 2;

FIG. 4 is a cross-sectional side view of a portion of another embodiment of a leadframe strip of the invention and a semiconductor die bonded thereto, as taken along line 3--3 of FIG. 2; and

FIG. 5 is a plan view of a wire-bonded semiconductor device having another embodiment of a leadframe of the invention.

DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

In the following discussion, the terms "upper" and "lower" are understood to include the inverse when referring to clamp members or leadframe levels of a bilevel leadframe.

As depicted in drawing FIGS. 2 and 3, a portion of an uncompleted exemplary semiconductor device 40 includes a semiconductor die 42 and a metal leadframe strip 44 to which the semiconductor die is attached. The final package outline 74 is shown with centerline 45. The leadframe strip 44 includes inner leads 46, outer leads 48, and spaced-apart side rails 50 and 52 for each of a plurality of leadframe panels 54. The inner leads 46 and outer leads 48 are supported from the side rails 50, 52 by dam bars 76. The outer leads 48 for the leadframe are only shown in part, but generally extend to a crossbar, not shown, or to the corresponding outer leads of the adjacent leadframe panels 54 of leadframe strip 44.

The leadframe strip 44 also includes a die mount paddle 60 which is configured for the mounting of the back side 62 of semiconductor die 42 thereon, using an adhesive layer 104 such as polyimide, epoxy, polymeric tape, etc. The adhesive layer 104 may be electrically nonconductive or conductive, depending upon the particular use for which the device is designed. The die mount paddle 60 is connected at each end 56, 58 to one of the leadframe rails 50, 52 by paddle support bars 78 and 80, and is supported thereby.

The semiconductor die 42 is illustrated as having an active surface 64 with a generally rectangular shape, although the semiconductor die may be of any shape. Bond pads 66 are arrayed adjacent the semiconductor die ends (edges) 68, 70 for conductive attachment to the inner leads 46 with thin bond wires 72. The wire bonding process may be one of thermocompression, ultrasonics or thermosonics, for example.

In accordance with the invention, the paddle 60 is formed with clamping tabs 90 on each non-supported side 82, 84, i.e., the sides not having a paddle support bar 78, 80. Each clamping tab 90 extends outwardly to underlie the upper clamp member 86 and be clamped thereby to a lower clamp member, not shown, which underlies a major portion of the leadframe panel 54. The clamping tabs 90 are shown with outer ends 88 not connected to inner leads 46, side rails 50, 52, or other parts of the leadframe panel 54. Thus, the presence of the clamping tabs 90 does not affect the choice of conductive or nonconductive adhesive layer 104. The clamping tabs 90 are configured to be totally encapsulated in the completed packaged semiconductor device 40.

Drawing FIG. 2 shows two clamping tabs 90 on each side 82, 84 of the paddle 60, the tabs 90 extending outwardly and converging toward each other. The clamping surface 102 of the upper clamp member 86 intersects and exerts clamping force on the tab clamping areas 106 of the clamping tabs 90. The clamping tabs 90 may take any reasonable shape which will make the paddle 60 more rigid but not result in shorting to leads or wires, and will not hinder polymer passage during encapsulation. Thus, the spacing 108 between the clamping tabs 90 and adjacent inner leads 46 and the space 110 between the two clamping tabs 90 permit adequate flow of polymer. The clamping tabs are shown as having a width comparable to the outer leads 48.

Preferably, the clamping tabs 90 are positioned so that there is no need for bond wires 72 to pass over the tabs.

As shown in the cross-sectional view of drawing FIG. 3, the inner leads 46 and die mount paddle 60 may be coplanar, and the upper clamp member 86 has a clamping surface 102 which surrounds wire-bonding access window 87 and compresses the inner leads 46, die mount paddle 60, and clamping tabs 90, as well as the paddle support bars 78, 80 (not visible) against the flat surface 98 of the lower clamp member 96, e.g. heater block.

An alternative configuration is shown in drawing FIG. 4, in which the die mount paddle 60 is depressed to a lower level 92 below an upper level 94 of the inner leads 46. The paddle support bars (see bar 78) and the clamping tabs 90 are bent upwardly from the semiconductor die 42 so that outer portions thereof underlie the clamping surface 102 of the upper clamp member 86 for firm clamping to the lower clamp member 96, e.g., heater block. While a packaged semiconductor device may be made with this alternate configuration, the coplanar configuration of drawing FIG. 3 is generally preferred for ease of manufacture.

Drawing FIG. 5 depicts a variation, alternative embodiment, of the invention in which the clamping tabs 90 also act as paddle support bars.

As shown in drawing FIG. 5, a portion of an uncompleted exemplary semiconductor device 40 includes a semiconductor die 42 and a metal leadframe strip 44 to which the semiconductor die 42 is attached. The final package outline 74 is shown with centerline 45. The leadframe strip 44 includes inner leads 46, outer leads 48, and side rails 50 and 52. The inner leads 46 and outer leads 48 are supported from the side rails 50, 52 by dam bars 76.

The leadframe strip 44 also includes a die mount paddle 60 which is configured for the mounting of the semiconductor die 42 thereon, as previously described.

The semiconductor die 42 is illustrated as having an active surface 64 with a generally rectangular shape. Bond pads 66 are arrayed adjacent the semiconductor die ends (edges) 68, 70 for conductive attachment to the inner leads 46 with thin bond wires 72. The wire bonding process may be one of thermocompression, ultrasonics or thermosonics, for example.

In accordance with this embodiment of the invention, the paddle 60 is formed with clamping tabs 90 on each of the sides 114, 116 having no (or few) bond pads 66. In contrast to the version shown in drawing FIGS. 2-4, the ends 56, 58 of the paddle 60 are not connected to the side rails 50, 52 by support bars. Each clamping tab 90 is integral with the paddle 60 over a major portion of the side 114 or 116. Each clamping tab 90 extends outwardly to underlie the upper clamp member 86 in tab clamping area 106 and be clamped thereby to a lower clamp member, not shown, which underlies a major portion of the leadframe strip 44. The clamping tabs 90 are shown with constricted outer ends 88 connected to dam bars 76 for supporting the paddle 60 during semiconductor die bond and wire bonding operations. Each clamping tab 90 is shown with apertures 112 therethrough whereby the flow of liquified polymer during semiconductor device encapsulation is not deleteriously impeded. The clamping tabs 90 are configured to be totally encapsulated in the completed packaged device 40.

The clamping tabs 90 may take any reasonable shape which will not result in shorting to leads or wires, and will not hinder polymer movement during encapsulation. Preferably, the tabs 90 are positioned so that there is no need for bond wires 72 to pass over the clamping tabs.

Following encapsulation, the tab ends 88 are severed, and the dam bars 76 removed to singulate the leads.

If desired, the die mount paddle may be formed of a material different from the inner leads 46 and outer leads 48. In the current state of the art, however, additional cost would be incurred.

A major advantage of the inclusion of clamping tabs 90 in the paddle 60 is the prevention of paddle movement during die bonding and the subsequent wire bonding operations. The reduced movement permits more secure bonding of the semiconductor die 42 to the paddle 60. In addition, the first wire bond, i.e., to the bond pad 66, as well as the second wire bond, i.e., to an inner lead 46, are stronger. As a result, the device failure rate may be significantly reduced.

An additional advantage of the invention is the enhanced heat spread and dissipation through the clamping tabs.

It is apparent to those skilled in the art that various changes and modifications may be made to the leadframe configurations of the invention, devices formed therefrom and methods of making and practicing the invention as disclosed herein without departing from the spirit and scope of the invention as defined in the following claims. 

What is claimed is:
 1. A leadframe for a semiconductor device, comprising:a pair of spaced apart rails; a die mount paddle including at least one clamping tab extending outwardly from said paddle, said clamping tab adapted to be clamped between a first clamping member and a second clamping member during wire bonding of a semiconductor die to said die mount paddle, thereby reducing movement of said die mount paddle; dam bars connecting said rails; and a plurality of leads, each lead having an inner end spaced from said die mount paddle, and each lead being joined to one of said dam bars.
 2. The leadframe of claim 1, further comprising paddle support bars extending outwardly from opposing ends of said paddle and connecting said paddle to said rails for support of said paddle.
 3. The leadframe of claim 1, wherein each said clamping tab is spaced from said inner ends of said plurality of leads and from any other clamping tabs at a distance sufficient to permit adequate flow of encapsulation material during encapsulation of said semiconductor device.
 4. The leadframe of claim 1, further comprising apertures in said at least one clamping tab.
 5. The leadframe of claim 1, wherein said at least one clamping tab is integral with said paddle.
 6. The leadframe of claim 1, wherein an outer end of said at least one clamping tab is discontinuous with said dam bars, said rails, and said plurality of leads.
 7. The leadframe of claim 1, wherein the outer end of each said clamping tab is discontinous with said dam bars, rails, leads, and any other clamping tabs.
 8. The leadframe of claim 1, wherein an outer end of said at least one clamping tab is joined to one of said dam bars and said rails for supporting and aligning said paddle.
 9. The leadframe of claim 1, wherein said inner leads, die mount paddle and at least one clamping tab are coplanar.
 10. The leadframe of claim 1, wherein said die mount paddle is depressed to a position below the level of said inner end of said plurality of leads and said at least one clamping tab is bent upwardly such that the inner portion of each said clamping tab is at the level of said die mount paddle while the outer end of each said clamping tab is at said level of said inner ends of said plurality of leads.
 11. A leadframe for a semiconductor die, comprising:a pair of spaced apart rails; a die mount paddle for securing said semiconductor die thereto, said die mount paddle including at least one clamping tab extending outwardly from said paddle, said clamping tab adapted to be clamped between a first clamping member and a second clamping member during wire bonding of a semiconductor die to said die mount paddle, thereby reducing movement of said die mount paddle; dam bars connecting said rails; a plurality of inner leads each inner lead having an inner end spaced from said die mount paddle and an outer end joined to one of said dam bars; and a plurality of outer leads, each outer lead having an inner end joined to one of said dam bars.
 12. The leadframe of claim 11, further comprising paddle support bars extending outwardly from opposing ends of said paddle and connecting said paddle to said rails for support of said paddle.
 13. The leadframe of claim 11, wherein each said clamping tab is spaced from said inner leads and from any other clamping tabs at a distance sufficient to permit adequate flow of encapsulation material during encapsulation of said semiconductor device.
 14. The leadframe of claim 11, further comprising apertures in said at least one clamping tab.
 15. The leadframe of claim 11, wherein said at least one clamping tab is integral with said paddle.
 16. The leadframe of claim 11, wherein an outer end of said at least one clamping tab is discontinuous with said dam bars, rails, inner leads and outer leads.
 17. The leadframe of claim 11, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads, outerleads and any other clamping tabs.
 18. The leadframe of claim 11, wherein an outer end of said at least one clamping tab is joined to one of said dam bars and said rails for supporting and aligning said paddle.
 19. The leadframe of claim 11, wherein said clamping tab is configured for wire bonding of said semiconductor die to said plurality of inner leads of said leadframe whereby the bond wires extend between said semiconductor die and said plurality of inner leads without passage over said at least one clamping tab.
 20. The leadframe of claim 11, wherein said inner leads, die mount paddle and at least one clamping tab are coplanar.
 21. The leadframe of claim 11, wherein said die mount paddle is depressed to a position below the level of said inner leads and said at least one clamping tab is bent upwardly such that the inner portion of each said clamping tab is at the level of said die mount paddle while the outer end of each said clamping tab is positioned to be clamped at said level of said inner leads.
 22. A leadframe for a semiconductor device assembly having a semiconductor die, comprising:a pair of spaced apart rails; a die mount paddle for securing the semiconductor die thereto, said die mount paddle including at least one clamping tab extending outwardly from said paddle, said clamping tab adapted to be clamped between a first clamping member and a second clamping member during wire bonding of said semiconductor die to said die mount paddle, thereby reducing movement of said die mount paddle; dam bars connecting said rails; a plurality of inner leads having inner ends spaced from said die mount paddle, each inner lead having an outer end joined to one of said dam bars; and a plurality of outer leads, each outer lead having an inner end joined to one of said dam bars.
 23. The leadframe of claim 22, further comprising opposing paddle support bars connecting said paddle to said rails for support of said paddle.
 24. The leadframe of claim 22, wherein said paddle is supported by paddle support bars extending from opposing ends of said paddle to said rails.
 25. The leadframe of claim 22, wherein each said clamping tab is spaced from said inner leads and from any other clamping tabs at a distance sufficient to permit adequate flow of encapsulation material during encapsulation of said semiconductor device.
 26. The leadframe of claim 22, further comprising apertures in said at least one clamping tab.
 27. The leadframe of claim 22, wherein said at least one clamping tab is integral with said paddle.
 28. The leadframe of claim 22, wherein the outer end of at least one said clamping tab is discontinuous with said dam bars, rails, inner leads and outer leads.
 29. The leadframe of claim 22, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads, outer leads and any other clamping tabs.
 30. The leadframe of claim 22, wherein the outer end of at least one said clamping tab is joined to one of said dam bars and said rails for supporting and aligning said paddle.
 31. The leadframe of claim 22, wherein said at least one clamping tab is configured for wire bonding of said semiconductor die to said plurality of inner leads whereby bond wires extend between said semiconductor die and said plurality of inner leads without passage over said at least one clamping tab.
 32. The leadframe of claim 22, wherein said inner leads, die mount paddle and at least one tabs is coplanar.
 33. The leadframe of claim 22, wherein said die mount paddle is depressed to a position below the level of said inner leads and said at least one clamping tab is bent upwardly such that the inner portion of each said clamping tab is at the level of said die mount paddle while the outer end of each said clamping tab is positioned to be clamped at said level of said inner leads.
 34. A leadframe used for connecting the leads thereof to the bond pads on the active surface of a semiconductor device, comprising:a pair of spaced apart rails; a die mount paddle for securing said semiconductor die thereto, said die mount paddle including at least one clamping tab extending outwardly from said paddle, said clamping tab adapted to be clamped between a first clamping member and a second clamping member during wire bonding of said semiconductor die to said die mount paddle, thereby reducing movement of said die mount paddle; dam bars connecting said rails; a plurality of inner leads having inner ends spaced from said die mount paddle, each inner lead having an outer end joined to one of said dam bars; and a plurality of outer leads, each outer lead having an inner end joined to one of said dam bars.
 35. The leadframe of claim 34, further comprising opposing paddle support bars connecting said paddle to said rails for support of said paddle.
 36. The leadframe of claim 34, wherein said semiconductor die comprises a rectangular active surface with bond pads arrayed along two opposing ends thereof, said paddle supported by paddle support bars extending from opposing ends of said paddle to said rails.
 37. The leadframe of claim 34, wherein said at least one lamping tab is spaced from said inner leads and from other clamping tabs for passage of a material therethrough for encapsulation of said semiconductor die.
 38. The leadframe of claim 34, further comprising apertures in said at least one clamping tab for passage of a material therethrough during encapsulation of said semiconductor die.
 39. The leadframe of claim 34, wherein said at least one clamping tab is integral with said paddle.
 40. The leadframe of claim 34, wherein outer end of said at least one clamping tab is discontinuous with said dam bars, rails, inner leads and outer leads.
 41. The leadframe of claim 34, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads, outer leads and any other clamping tabs.
 42. The leadframe of claim 34, wherein an outer end of said at least one clamping tab is joined to one of said dam bars and said rails for supporting and aligning said paddle.
 43. The leadframe of claim 34, wherein said at least one clamping tab is configured for wire bonding said bond pads of said semiconductor die to said plurality of inner leads whereby bond wires extend between said bond pads of said semiconductor die and said plurality of inner leads without passage over said at least one clamping tab.
 44. The leadframe of claim 34, wherein said inner leads, die mount paddle and at least one clamping tab is coplanar.
 45. The leadframe of claim 34, wherein said die mount paddle is depressed to a position below the level of said inner leads and each said clamping tab is bent upwardly such that the inner portion of each said clamping tab is at the level of said die mount paddle while the outer end of each said clamping tab is positioned to be clamped at said level of said inner leads.
 46. A leadframe for an encapsulated semiconductor device assembly having a semiconductor die therein, comprising:a pair of spaced apart rails; a die mount paddle for bonding of said semiconductor die thereto, said die mount paddle including at least one clamping tab extending outwardly from said paddle, said clamping tab adapted to be clamped between a first clamping member and a second clamping member during wire bonding of said semiconductor die to said die mount paddle, thereby reducing movement of said die mount paddle; dam bars connecting said rails; a plurality of inner leads having inner ends spaced from said die mount paddle, each inner lead having an outer end joined to one of said dam bars; and a plurality of outer leads, each outer lead having an inner end joined to one of said dam bars.
 47. The leadframe of claim 46, further comprising:opposing paddle support bars connecting said paddle to said rails for support of said paddle.
 48. The leadframe of claim 46, wherein said semiconductor die comprises a rectangular active surface with bond pads arrayed along two opposing ends thereof, said paddle supported by paddle support bars extending from said opposing ends of said paddle to said rails.
 49. The leadframe of claim 46, wherein said at least one clamping tab is spaced from said inner leads and from other clamping tabs for passage of a material therethrough during the encapsulation of said semiconductor die.
 50. The leadframe of claim 46, further comprising apertures in said at least one clamping tab for passage of a material therethrough during encapsulation of said semiconductor die.
 51. The leadframe of claim 46, wherein said at least one clamping tab is integral with said paddle.
 52. The leadframe of claim 46, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads and outer leads.
 53. The leadframe of claim 46, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads, outer leads and any other clamping tabs.
 54. The leadframe of claim 46, wherein the outer end of each said clamping tab is joined to one of said dam bars and said rails for supporting and aligning said paddle prior to and during bonding of said semiconductor die thereto and wire bonding said semiconductor die to said plurality of inner leads.
 55. The leadframe of claim 46, wherein each said clamping tab is configured for wire bonding whereby bond wires extend between said semiconductor die and said plurality of inner leads without passage over said clamping tab.
 56. The leadframe of claim 46, wherein said inner leads, die mount paddle and said at least one clamping tab are coplanar.
 57. The leadframe of claim 46, wherein said die mount paddle is depressed to a position below the level of said inner leads and said at least one clamping tab is bent upwardly such that the inner portion of each said clamping tab is at the level of said die mount paddle while the outer end of each said clamping tab is positioned to be clamped at said level of said inner leads.
 58. A packaged semiconductor device assembly, comprising:a conductive leadframe having a pair of spaced apart rails, a die mount paddle, dam bars connecting said rails, a plurality of inner leads having inner ends spaced from said die mount paddle, a plurality of outer leads, and at least one clamping tab integral with said paddle, said clamping tab adapted to be clamped between a first clamping member and a second clamping member during wire bonding of said semiconductor die to said die mount paddle, thereby reducing movement of said die mount paddle; a semiconductor die having a back side bonded to said die mount paddle and an active surface having a plurality of bond pads thereon; a plurality of conductive wires connecting said plurality of bond pads to said plurality of inner leads; and material encapsulating and sealing said inner leads, paddle, wires and clamping tabs.
 59. The packaged semiconductor device of claim 58, further comprising opposing paddle support bars connected from said paddle to said rails for support of said paddle.
 60. The packaged semiconductor device assembly of claim 38, wherein said die comprises a rectangular active surface with bond pads arrayed along two opposing ends thereof, said paddle supported by paddle support bars extending from said opposing ends of said paddle to said rails.
 61. The packaged semiconductor device assembly of claim 38, wherein said at least one clamping tab is spaced from said inner leads and from other clamping tabs for passage of liquified polymer therethrough.
 62. The packaged semiconductor device assembly of claim 38, further comprising apertures in said at least one clamping tab for passage of said material therethrough.
 63. The packaged semiconductor device assembly of claim 38, wherein said at least one clamping tab is integral with said paddle.
 64. The packaged semiconductor device of claim 38, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads and outer leads.
 65. The packaged semiconductor device of claim 38, wherein the outer end of each said clamping tab is discontinuous with said dam bars, rails, inner leads, outer leads and any other clamping tabs.
 66. The packaged semiconductor device of claim 38, wherein the outer end of each said clamping tab is joined to one of said dam bars and said rails for supporting and aligning said paddle.
 67. The packaged semiconductor device of claim 38, wherein each said clamping tab is configured for wire bonding whereby bond wires extend between said plurality of bond pads of said semiconductor die and said plurality of inner lead without passage over said clamping tab.
 68. The packaged semiconductor device assembly of claim 38, wherein said inner leads, die mount paddle and at least one clamping tabs is coplanar.
 69. The packaged semiconductor device of claim 38, wherein said die mount paddle is depressed to a position below the level of said inner leads and each said clamping tab is bent upwardly such that the inner portion of each said clamping tab is at the level of said die mount paddle while the outer end of each said clamping tab is positioned to be clamped at said level of said inner leads. 